“These bats are on the verge of completely dying out,” says Affleck. “Not only would we lose an extraordinary species, the death of our bats would be catastrophic to our ecosystem.”

To help the cause, director Zack Snyder organized a "build-a-bat-house" day on the set of "Batman v Superman," inviting members of SaveBats.org to show off their rescue bats and assist with creating some new homes for future populations. In support of the production's green initiatives, all of the bat houses were built using recycled set pieces from the film.

"I think that we all just take for granted that there's bats and that bats are going to be fine," Snyder says in the video. "But then as we started doing the research, we actually discovered that the bats are in dire straits. As a movie that benefits from the bats, we thought we'd build these bat habitats as a way to raise awareness, and just generally, let's learn about bats and how they benefit us because they're really important."